3.	Revisions in Estimates

Our profit recognition related to construction contracts is based on estimates of costs to complete each project. These estimates can vary significantly in the normal course of business as projects progress, circumstances develop and evolve, and uncertainties are resolved. When we experience significant changes in our estimates of costs to complete, we undergo a process that includes reviewing the nature of the changes to ensure that there are no material amounts that should have been recorded in a prior period rather than as revisions in estimates for the current period. For revisions in estimates, generally we use the cumulative catch-up method for changes to the transaction price that are part of a single performance obligation. Under this method, revisions in estimates are accounted for in their entirety in the period of change. There can be no assurance that we will not experience further changes in circumstances or otherwise be required to revise our cost estimates in the future.

In our review of these changes for the three months ended March 31, 2018, we did not identify any material amounts that should have been recorded in a prior period. In our review of these changes for the three months ended March 31, 2017, we identified and corrected amounts that should have been recorded during the three months ended September 30, 2016. This correction resulted in a $4.9 million decrease to Large Project Construction revenue and gross profit and a $1.6 million increase in net loss attributable to Granite Construction Incorporated for the three months ended March 31, 2017. We have assessed the impact of this correction to the financial statements of prior periods’ as well as to the financial statements for the three months ended March 31, 2017 and the year ended December 31, 2017 and have concluded that the amounts were not material.

In the normal course of business, we have revisions in estimated costs some of which are associated with unresolved affirmative claims and back charges. The estimated or actual recovery related to these estimated costs may be recorded in future periods or may be at values below the associated cost, which can cause fluctuations in the gross profit impact from revisions in estimates.

Affirmative Claims

Revisions in estimates for the three months ended March 31, 2018 included an increase in revenue of $2.6 million related to the estimated cost recovery of customer affirmative claims, which included increases of $2.1 million that were also affected by an increase in estimated contract costs in excess of the estimated recovery during the three months ended March 31, 2018. The remaining $0.5 million had estimated contract costs in excess of the estimated cost recovery that were recorded in prior periods.

Revisions in estimates for the three months ended March 31, 2017 included a net increase in revenue of $1.8 million related to the estimated cost recovery of customer affirmative claims, which included increases of $2.7 million that were also affected by an increase in estimated contract costs in excess of the estimated recovery during the three months ended March 31, 2017. Estimated contract costs in excess of estimated cost recovery were recorded in prior periods for the offsetting decrease of $0.9 million.

Back Charges

Revisions in estimates for the three months ended March 31, 2018 included a reduction of cost of revenue of $0.4 million related to the estimated recovery of back charges of which $0.2 million was also affected by an increase in estimated contract costs that were in excess of the estimated recovery during the three months ended March 31, 2018. The remaining $0.2 million had estimated contract costs in excess of estimated cost recovery that were recorded in prior periods.

Revisions in estimates for the three months ended March 31, 2017 included a reduction of cost of revenue of $0.3 million related to the estimated recovery of back charges all of which had estimated contract costs in excess of estimated cost recovery recorded in prior periods.

The tables below include the impact to gross profit from significant revisions in estimates related to estimated and actual recovery of customer affirmative claims and back charges as well as the associated estimated contract costs.

Construction

There were no changes in project profitability from revisions in estimates, which individually had an impact of $1.0 million or more on gross profit during the three months ended March 31, 2018 and 2017.

Large Project Construction

The changes in project profitability from revisions in estimates, both increases and decreases, which individually had an impact of $1.0 million or more on gross profit, were decreases of $7.9 million and $13.0 million for the three months ended March 31, 2018 and 2017, respectively.

There were no amounts attributable to non-controlling interests for the three months ended March 31, 2018. The amounts attributable to non-controlling interests were $1.6 million of the net decrease for the three months ended March 31, 2017. The projects are summarized as follows:

Decreases

		Three Months Ended March 31,
(dollars in millions)		2018			2017
Number of projects with downward estimate changes			2			5
Range of reduction in gross profit from each project, net	$	2.6 - 5.3		$	1.3 - 4.7
Decrease on project profitability	$	7.9		$	13.0

The decreases during the three months ended March 31, 2018 were due to owner-related and higher costs than originally anticipated and a decrease in estimated recovery from customer affirmative claims. The decreases during March 31, 2017 were due to higher costs than originally anticipated as well as additional design, weather and owner-related costs, net of estimated and actual recovery from customer affirmative claims. As of March 31, 2018, there were four projects for which additional costs were reasonably possible in excess of the probable amounts included in the cost forecast. The reasonably possible aggregate range that has the potential to adversely impact gross profit during the year ended December 31, 2018 was zero to $47.0 million. As the related projects proceed, future estimates may change and could have a material effect on our financial position, results of operations and/or cash flows in the future.